Not sure why earlier tests did not catch it, but there are more
places where we bump into problems because `eieio--class-precedence-list`
now returns also non-EIEIO classes.
* lisp/obsolete/eieio-compat.el
(eieio--generic-static-object-generalizer):
* lisp/emacs-lisp/eieio-core.el (eieio--generic-generalizer)
(eieio--generic-subclass-specializers): Handle non-EIEIO parents.
* test/lisp/emacs-lisp/eieio-tests/eieio-test-methodinvoke.el
(eieio-test-method-order-list-7): Adjust test.
5beb56fb53